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Good Day! Does anyone know any air/water/fuel bladder manufacturers. Im looking for airbags in a semicylindrical shape. Profile should be in a semicircle 12" diameter and 17" long. Kind Regards

its a system for taking measuring sensors down to the seabed

The 3 psi differential pressure is just perfect for us. Thanks again and that was very helpful.

sorry more clearer: If at 50m if the bags are inflated to 6.02bars, they will inflate to their maximum unstretched volume?

So your saying that if the airbags will be inflated to ColB pressure, they will be inflated to their unstretched volume?

Ok this is what i came up with calculating the pressure needed for inflating the volume of airbag at different depths The attached excel sheet http://files.engineering.com/getfile.aspx?folder=e7558cf0-782d-4867-86d2-336cb0a1c663&file=Pressure_calculation.xlsx

BigInch, how can i calculate the pressure needed to inflate the airbags back to its 100% volume. Because I will be adding extra volume of air to the airbags, the P1V1=P2V2 wont work. I guess I can calculate the density of air at different depths/pressures, but then what formula can tell me the...

at 50m depths? I doubt it. The solenoids will be actuated after the magnetic have done their job, so they will not affect the sensors

ok, after reading more, i actually realized my mistake. My bad! Now i have a another question. Because I have to raise the pressure in the airbags by a certain constant dependent on the surrounding pressure to completely inflate the bags, is there any mechanical way to prevent the airbags from...

To be honest Im getting a little confused here. The question is whether the bags will inflate to the same volume with the pressure differential of 3psi at depths of say 50m as it would inflate at atmospheric conditions with a pressure differential of 3psi?

the problem with 304 is that it is magnetic, and my system has to non magnetics, as it will carry magnetic sensor equipment.

so I guess I have to take the total volume in the airbottles and the airbags as once the valves are open, it all becomes one big open system. That would actually make sence now.

Yes i am using scuba tanks, good guess! I looked at scuba regulators, but need something with 1/4" connection, was hoping to find something more "industrial"

BigInch, doesnt that apply to closed systems? Ive got 3000psi airbottle that has lots of air to supply. Wont the pressure in the airbags start getting higher only after inflating them all the way?

u have any brands in mind? i looked at swagelok and parker but they are expensive

so if i apply the same differential pressure, it would not inflate to the same volume? y is that? U have any links on explaining the physics behind it?

Anybody know any pressure reducing valves from 3000psi to 200-300psi made out of 316SS?

Well Im doing testing right now and 3psi at depth of 1m is fine. As long as there is enough pressure to balance the surrounding pressure and a bit more(3psi) how the lower depths (higher pressures) would effect the inflated volume of the airbags compared to atmospheric conditions.

Good Day! Im a starting engineer and I was set a task to design a flotation system for an unmanned device that drops to seabed, and has to pop up back to the surface. The flotation system is only engaged when the system has to ascend back to the surface Now what I started off is 2 scuba...